Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc34eb0bfd17021d…

MALICIOUS

PDF

34.2 KB Created: 2020-08-09 18:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d584cbc5e1e3d0d26d2fab09d28376ed SHA-1: ee5b0723c56de40d3e539c4d1846fa0960f950d6 SHA-256: cc34eb0bfd17021dce61a201bcfa33f47d042490ee394062be5cd3d432d054c6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=binary+addition+questions+and+answers+pdf'. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL and references to PDF documents, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=binary+addition+questions+and+answers+pdf
    • http://rawexipe.jordanbc.org/uploads/1/3/1/4/131453278/penofifuleporerene.pdf
    • http://files.ekphrastic.net/uploads/1/3/1/8/131856076/vavonut-remataluwi-bukitumidodu-zedotogexiwiri.pdf
    • http://files.homesweetfarm.com/uploads/1/3/0/7/130776077/tesukijadobok.pdf
    • http://files.restauranthibiscus.com/uploads/1/3/0/7/130776841/5106130.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/zinaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/ligoku.pdf
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/77867857329.pdf
    • https://cdn.shopify.com/s/files/1/0435/4224/9631/files/40992745525.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1314/files/stihl_sso_portal.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/pevagesegemetotopewenari.pdf
    • https://cdn.shopify.com/s/files/1/0438/7838/3771/files/spanair_flight_5022.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/3896614465.pdf
    • https://cdn.shopify.com/s/files/1/0438/3247/5798/files/tadujabinupikonukorekulon.pdf
    • https://cdn.shopify.com/s/files/1/0433/7798/3653/files/43414591719.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/lixewesajazenibap.pdf
    • https://cdn.shopify.com/s/files/1/0436/5955/9065/files/79517343654.pdf
    • https://cdn.shopify.com/s/files/1/0435/7649/2195/files/keith_urban_kiss_a_girl.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004862.bin
3313ace91974ee41fcbdeafb46e2567f412170ad4e84a9df009dbd1a91236a62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4862 5372 bytes
font_01_sfnt_off00005ad0.bin
fc0901d14ca79e8e2fa28ec2646c974422cf0607c232c8360690dc67f05ef944		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD0 9560 bytes

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